iSCSI and jumbo frames

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

	Hello,

	I'm not sure you remember I have tried to use a few weeks ago a qNAP
NAS (iSCSI) with a 9.1 NetBSD server without success as re driver panics
when mtu is greater than 1500 bytes.

	This morning, I have replaced this old PCI Realtek adapter by a new one
(dual Gbe, PCIe, Intel) :

legendre# pcictl pci0 list | grep -i ethernet
000:25:0: Intel I218-V Ethernet Connection (ethernet network)
002:00:0: Intel I350 Gigabit Network Connection (ethernet network,
revision 0x01)
002:00:1: Intel I350 Gigabit Network Connection (ethernet network,
revision 0x01)
006:00:0: Intel i82574L 1000baseT Ethernet (ethernet network)
007:00:0: Intel i82574L 1000baseT Ethernet (ethernet network)

	Configuration :
000:25:0: Intel I218-V => wm2, WAN
002:00:0: Intel I350 => wm0, qNAP
002:00:1: Intel I350 => not used
006:00:0: Intel i82574L => agr0, LAN
007:00:0: Intel i82574L => agr0, LAN

	Of course, I have reconfigured all interfaces, and wm0's mtu is set to
9000 :
legendre# ifconfig wm0
wm0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 9000
...

	On qNAP, I have set also mtu to 9000. But iSCSI packets are not greater
than 1448 bytes :

23:38:56.260247 IP legendre.systella.fr.65516 >
euclide.systella.fr.iscsi-target: Flags [P.], seq 936737288:936737888,
ack 4553905, win 4197, options [nop,nop,TS val 92106 ecr 887624208],
length 600
23:38:56.260255 IP legendre.systella.fr.65516 >
euclide.systella.fr.iscsi-target: Flags [.], seq 936737888:936739336,
ack 4553905, win 4197, options [nop,nop,TS val 92106 ecr 887624208],
length 1448
23:38:56.260265 IP legendre.systella.fr.65516 >
euclide.systella.fr.iscsi-target: Flags [.], seq 936739336:936740784,
ack 4553905, win 4197, options [nop,nop,TS val 92106 ecr 887624208],
length 1448
23:38:56.260295 IP legendre.systella.fr.65516 >
euclide.systella.fr.iscsi-target: Flags [.], seq 936740784:936742232,
ack 4553905, win 4197, options [nop,nop,TS val 92106 ecr 887624208],
length 1448
23:38:56.260303 IP legendre.systella.fr.65516 >
euclide.systella.fr.iscsi-target: Flags [.], seq 936742232:936743680,
ack 4553905, win 4197, options [nop,nop,TS val 92106 ecr 887624208],
length 1448
...

	I suppose I have done a mistake somewhere. How can I indicate to iscsid
to use jumbo frames ?

	Best regards,

	JKB